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Repairing the Bottom of a Bifold Door Bifold doors can be great for saving space however, they can be frustrating when they begin to bow or scrape against the floor. The good part is that these issues are often easy to fix with a few simple adjustments. If your bifold doors are scratching on the floor, it could be due to a broken track or worn roller. The damaged rollers should be replaced. Bottom pivot As time passes the pivot pin at the bottom of a bifold door can loosen or